<template>
    <div class="spec-preview">
        <img :src="skuInfo.skuDefaultImg" />
        <div class="event" @mousemove="move"></div>
        <div class="big">
            <img
                :src="skuInfo.skuDefaultImg"
                :style="{ left: -2 * left + 'px', top: -2 * top + 'px' }"
                @click="getImgUrl(skuInfo.skuDefaultImg)"
            />
        </div>
        <div class="mask" :style="{ left: left + 'px', top: top + 'px' }"></div>
    </div>
</template>

<script>
import { mapGetters } from 'vuex';
export default {
    name: 'Zoom',
    data() {
        return {
            left: 0,
            top: 0,
        };
    },
    computed: {
        ...mapGetters('detail', ['skuInfo']),
    },
    methods: {
        move(e) {
            let x = e.offsetX - 100;
            if (x < 0) {
                x = 0;
            }
            if (x > 200) {
                x = 200;
            }

            let y = e.offsetY - 100;
            if (y < 0) {
                y = 0;
            }
            if (y > 200) {
                y = 200;
            }

            this.left = x;
            this.top = y;
        },
        getImgUrl(imgUrl) {
            this.$bus.$emit('get-imgUrl', imgUrl);
        },
    },
};
</script>

<style lang="less">
.spec-preview {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid #ccc;

    img {
        width: 100%;
        height: 100%;
    }

    .event {
        width: 100%;
        height: 100%;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 998;
    }

    .mask {
        width: 50%;
        height: 50%;
        background-color: rgba(0, 255, 0, 0.3);
        position: absolute;
        left: 0;
        top: 0;
        display: none;
    }

    .big {
        width: 100%;
        height: 100%;
        position: absolute;
        top: -1px;
        left: 100%;
        border: 1px solid #aaa;
        overflow: hidden;
        z-index: 998;
        display: none;
        background: white;

        img {
            width: 200%;
            max-width: 200%;
            height: 200%;
            position: absolute;
            left: 0;
            top: 0;
        }
    }

    .event:hover ~ .mask,
    .event:hover ~ .big {
        display: block;
    }
}
</style>
